Rivet and burr



. F. R. WHITE RIVET AND BURR Oct. '11, 1938.

Filed Jan. 2o, 1956 Patented Oct. 11, 1938 PATENT OFFICE RIVET AND BURRFranklin R. White, Waterbury, Conn., assignor to The Patent ButtonCompany, Waterbury, Conn., a corporation of Connecticut ApplicationJanuary 20, 1936, Serial No. 59,941

2 Claims.

My invention relates to new and useful improvements in rivets and burrs,and has for an object to especially provide a burr that will have aclean smooth cutting edge, so that if ever necessary to remove the samefrom the cloth, it will not tear the cloth and the hole, cut by theburr, will have sharp and clean edges.

A further object of the invention is to provide a burr, wherein themouth, besides having a smooth non-jagged cutting edge, at the same timewill be suciently flared to permit easy and accurate entrance of therivet.

As is well known,`these rivets and burrs are machine-attached, andalthough the machines are very accurate, it sometimes happens that therivet will not be in absolute alignment with an opening in the burr. Asthe mouth of the burr is relatively small, there is a possibility of therivetA passing to one side of the same. Therefore, a flared hub andmouth (within certain'limits) are to be desired.

A still further object of the invention is to turn back the edge of themetal at the mouth of the flared hub to not only make a sharper smoothercutting edge but also reinforce the flared mouth and thus provide astronger hub to guide the rivet in its entrance into the burr.

Still another object of the invention is to combine in the one burr anexceptionally clean cutting edge and a flared mouth, the flared mouthbeing reinforced by turning the metal inwardly back on itself within thehub of the burr.

With these and other objects in View, the invention consists in certainnew and novel features and combination of parts, as will be hereinaftermore fully explained and pointed out in the claims.

Referring now to the drawing showing a preferred embodiment,

Fig 1 is an enlarged top plan View of a fragmentary portion of clothwith the burr and rivet attached thereto;

Fig. 2 is an enlarged sectional View taken onA the line 2 2 of Fig. 1;

Fig.'3 is an enlarged fragmentary View, similar to Fig. 1, of a piece ofcloth with the burr removed, showing the substantially sharp-cut holeformed during the attachment of the burr;

Fig. 4 is an enlarged sectional view of the burr and a side elevation ofthe rivet, showing them in an attaching position;

Fig. 5 is an enlarged plan View of the disk from which the burr isformed;

Fig. 6 is an elevational view of the same;

Fig. '7 is a View similar to Fig. 5 but with the burr being partly drawninto shape;

Fig. 8 is a sectional view thereof;

Fig. 9 is a view similar 'to Fig. 5. but with a further step in theformation of the burr;

Fig. 10 is a sectional view of the same;

Fig. 11 is a view similar to Fig. 5 showing the next to the last step inthe formation of the burr;

Fig. 12 is a sectional view thereof;

Fig. 13 is a view similar to Fig. 5 with the burr in its completed form,the edge of the mouth being now turned back within the hub;

Fig. 14: is a sectional view thereof;

Fig. 15 is a bottom plan view of the completed burr.

At the outset, it might be mentioned that it is desirable in the..formation of burrs that the mouth or end of the' hub of the burr berelatively sharp, as if this is not so and the burr is wrongly placedand hasV to `be removed, the rough or broken edge of theburr often, inits removal, catches in the threads and makes a torn or, what might betermed, a rough hole in the garment, which will cause it to be classedas a second. However, if the burr can be so made that theedges arerelatively sharp and can cut a clean hole in the garment, a smallmisplaced hole willnot be noticeable and the garment will passinspection.

I have found, therefore, that if the burr has a ared mouth and theordinary rough edge is turned inwardly of the hub and back on itself,the cutting edge will be relatively sharp and produce a clean-cut holewhen attached.

These burrs are generally formed of copper and unless the edge is turnedback, the cutting edge is likely to be dull and ragged.

Referring now more generally to the several views, and for the moment toFig. 5, there is shown on an enlarged scale a disk I of copper, which is'rst subjected to proper dies, so that the disk will then take the shapeas shown in Fig. 7, that is, the metal will be flowed torform adownwardly extending incomplete hub 2.

The partly formed blank is now subjected to still further dies (notshown), so that the blank will have the appearance shown in Fig. 9, thatis, the central portion of the disk (the hub) has been furtherelongated, as may be seen at 3. The rim 4 is still retained and, as yet,there is no mouth in the hub.

This partly formed blank is then subjected to further dies (not shown),so that there is now the open mouth 5 at the end of the hub, and thesaid huby is slightly inwardly flared about centrally of its length, asat 6, while the portion just adjacent the mouth 5, such as at 1, willextend slightly inwardly, as may be seen in Fig. 12.

The burr is then subjected to the final dies (not shown), so that theedge forming the mouth 5 is now turned inwardly and back on itselfwithin the mouth, as may be seen at 8 (Fig. 14) and at the same time,the mouth is flared slight ly outwarly, as may be seen at 9.

A construction of this kind has three distinct advantages. wide aspossible, there is a better chance of the prong l ila of the rivet l0registering with` the hub of the burr while being attached.

In the second place, by `turning the ragged edge of the metal back,inwardly on itself, as at 8, there is now provided a smooth cutting edgeat the mouth of the burr, which is not possible to obtain unless thismetal is turned back as described.

In the third place, the mouth o-f the burr is strengthened, so that asthe prong Illa is driven up into the mouth of the rivet and into thehub, it will form a better and stronger guide for the rivet.

It will be understood that in most attaching machines, the burr ispositioned over the cloth and the tack or rivet is fed` to pierce theunder surface of the cloth, as shown in Fig. 2. In this iigure, I haveshown the cloth I l, the rivet driven up into the hub of the burr andmutilated or deformed by a plunger (not shown) vto tightly fasten theburr withV respect to the rivet.

It will also be understood that the mouth of the rivet must not beflared too much, as then when the pressure is applied to deform therivet and to compress the rivet and burr in their tight relationship,the burr' might break down and would then mutilate the cloth if and Whenremoved. In other words, the mouth should be flared to provide su'iciententrance for the insertion of the prong of the rivet but must not breakdown or lose its form when being attached.

As mentioned, by turning in the metal at the mouth, there are no finso-r rough spots in the cutting edge but, on the other hand, there is aknifelike edge provided that will cut a relatively First, by making themouth als clean hole in the material to which it is attached.Furthermore, if necessary to remove the burr in case of misplacement,there is no possibility of the mouth of the burr or the cutting edgetearing the threads of the fabric as it is removed from the garment.

It is to be remembered that there is considerable pressure used inforcing the burr through the cloth and deforming the prong I0a in theattaching operation, and the stronger the burr, the less chance of itsbeing mutilated.

From the foregoing, it will be seen that by forming a burr With aslightly flared mouth and by turning back the metal at the mouth, notonly is the mouth made large enough to provide a better chance ofentrance of the prong and not only is the burr strengthened, but arelatively clean hole is cut through the garment during the attachingoperation and, if the burr is to be removed, the edges of the hole willremain in their clean-cut condition.

Having thus` described my invention, what I claim as new and desire tosecure by Letters Patent is:-

1. As an article of manufacture, a rivet and burr, said burr formed ofrelatively soft thin metal including an upper plate and a centraldepending restricted hub, the mouth of the hub being flared outwardlyand the metal at the mouth being turned inwardly and pressed backagainst the wall of the hub and extending just over the edge forming arelatively smooth cutting edge, said rivet adapted to be forced intosaid burr and be deformed in the burr, the mouth of the hub beingslightly larger than the diameter of the base of the prong of the rivet.

2. A relatively soft thin metal burr comprising a circular disk having acentral depending hub, the mouth of the hub being flared, the metal atthe mouth being turnedl back inwardly extending just over the edgetoprovide a clean cutting edge andthe said cutting edge being compressedand sharp enough to cut the cloth during attachment of the burr, and arivet adapted to be passed through the hub of the burr and be deformedat the top of the burr to hold the burr` with respect to the rivet.

Y FRANKLIN R. WHITE.

